One reason I've long been opposed to Monotheism is its intolerance.

As you doubtless know, 'pagan' faiths in pre-Christian times were much more tolerant. People took their Gods with them to other countries, nobody thought any the less of them. 'Well, he's Egyptian, so he worships Amun.' No big deal.

When the Hebrews returned from Babylon they seemed to 'get religion' in the worst way - possibly due to a desire
to preserve their national identity. Christians followed that approach, as did Muslims. Greco-Romans NEVER understood it.

Christians seem to have a need to feel persecuted - and to persecute others.